Is it legal not to pay the property fee or remember the license plate?

Illegal. According to the "Property Management Regulations", the owner should pay the property service fee according to the agreement in the property service contract. If the owner and the user of the property agree that the user of the property will pay the property service fee, according to the agreement, the owner shall bear joint and several liability, and the completed property that has not been sold or handed over to the property buyer shall be paid by the construction unit.